[Python] How to get data from another model in DetailView

I'm trying to get objects from two models using DetailView. First, I set urls.py:

from django.urls import path
from . views import RetiroListView, RetiroDetailView
from . import views

urlpatterns = [
path('post/<intk>/', PostDetailView.as_view(), name='post-detail'),
path('post/', views.post, name='post-post'),
]


Here are my models:

from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User

# Create your models here.

class Post(models.Model):

title = models.CharField(max_length=100)
content = models.TextField()
date_posted = models.DateTimeField(default=timezone.now)
author = models.ForeignKey(User, on_delete=models.CASCADE)

class Comment(models.Model):
post = models.OneToOneField(Post, on_delete=models.CASCADE, primary_key=True)
comment=models.CharField(max_length=100)

class Tags(models.Model):
post = models.OneToOneField(Post, on_delete=models.CASCADE, primary_key=True)
comment=models.CharField(max_length=100)


and the detail view:

class PostDetailView(DetailView):
model = Post


Now, in my template, I can use:

{{ object.title }}

To access my post information but, I need to get some info from the other tables, in this view. I know I have to overwrite the get_context_data method, but I don't know how.

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